GNU bug report logs - #16645
24.3; in xterm, keypad = is translated to M-o x

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; in xterm, keypad = is translated to M-o x
Date: Wed, 05 Feb 2014 00:58:14 +0100

With "emacs -Q -nw" in xterm, the keypad = key (keysym 0xffbd, KP_Equal)
is translated to M-o x instead of the = character.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.6)
 of 2013-12-22 on brahms, modified by Debian
System Description:	Debian GNU/Linux unstable (sid)

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Message #8 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: 16645 <at> debbugs.gnu.org
Subject: Re: 24.3; in xterm, keypad = is translated to M-o x
Date: Wed, 5 Feb 2014 01:15:48 +0100

On 2014-02-05 00:58:14 +0100, Vincent Lefevre wrote:
> With "emacs -Q -nw" in xterm, the keypad = key (keysym 0xffbd, KP_Equal)
> is translated to M-o x instead of the = character.

According to "tack", the keypad "=" gives:

^[OX       Unknown

instead of

=          Unknown

Then, I don't know yet whether this is intentional or this is a bug
in xterm. And why the different case for "o" and "x" (uppercase in
tack, lowercase in Emacs)?

In any case, I can see nothing about kp-equal in the xterm.el file.
About the keypad, just:

    (define-key map "\eOj" [kp-multiply])
    (define-key map "\eOk" [kp-add])
    (define-key map "\eOl" [kp-separator])
    (define-key map "\eOm" [kp-subtract])
    (define-key map "\eOo" [kp-divide])
    (define-key map "\eOp" [kp-0])
    (define-key map "\eOq" [kp-1])
    (define-key map "\eOr" [kp-2])
    (define-key map "\eOs" [kp-3])
    (define-key map "\eOt" [kp-4])
    (define-key map "\eOu" [kp-5])
    (define-key map "\eOv" [kp-6])
    (define-key map "\eOw" [kp-7])
    (define-key map "\eOx" [kp-8])
    (define-key map "\eOy" [kp-9])

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Message #11 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: 16645 <at> debbugs.gnu.org
Subject: Re: 24.3; in xterm, keypad = is translated to M-o x
Date: Wed, 5 Feb 2014 02:17:01 +0100

On 2014-02-05 01:15:48 +0100, Vincent Lefevre wrote:
> On 2014-02-05 00:58:14 +0100, Vincent Lefevre wrote:
> > With "emacs -Q -nw" in xterm, the keypad = key (keysym 0xffbd, KP_Equal)
> > is translated to M-o x instead of the = character.
> 
> According to "tack", the keypad "=" gives:
> 
> ^[OX       Unknown
> 
> instead of
> 
> =          Unknown
> 
> Then, I don't know yet whether this is intentional or this is a bug
> in xterm.

It was due to my XKB settings (only the "=" keypad key gave a
KP_something keysym due to missing configuration for this key,
contrary to the other keypad ones). So, now that the "=" keypad
key gives a normal "=" keysym, the problem is no longer visible
in Emacs on my machine. However I'm still wondering about the
remarks below:

> And why the different case for "o" and "x" (uppercase in
> tack, lowercase in Emacs)?
> 
> In any case, I can see nothing about kp-equal in the xterm.el file.
> About the keypad, just:
> 
>     (define-key map "\eOj" [kp-multiply])
>     (define-key map "\eOk" [kp-add])
>     (define-key map "\eOl" [kp-separator])
>     (define-key map "\eOm" [kp-subtract])
>     (define-key map "\eOo" [kp-divide])
>     (define-key map "\eOp" [kp-0])
>     (define-key map "\eOq" [kp-1])
>     (define-key map "\eOr" [kp-2])
>     (define-key map "\eOs" [kp-3])
>     (define-key map "\eOt" [kp-4])
>     (define-key map "\eOu" [kp-5])
>     (define-key map "\eOv" [kp-6])
>     (define-key map "\eOw" [kp-7])
>     (define-key map "\eOx" [kp-8])
>     (define-key map "\eOy" [kp-9])

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Message #14 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Vincent Lefevre <vincent <at> vinc17.net>
Cc: 16645 <at> debbugs.gnu.org
Subject: Re: bug#16645: 24.3; in xterm, keypad = is translated to M-o x
Date: Sat, 28 Mar 2020 01:55:40 +0100

Vincent Lefevre <vincent <at> vinc17.net> writes:

> On 2014-02-05 01:15:48 +0100, Vincent Lefevre wrote:
>> On 2014-02-05 00:58:14 +0100, Vincent Lefevre wrote:
>> > With "emacs -Q -nw" in xterm, the keypad = key (keysym 0xffbd, KP_Equal)
>> > is translated to M-o x instead of the = character.
>> 
>> According to "tack", the keypad "=" gives:
>> 
>> ^[OX       Unknown
>> 
>> instead of
>> 
>> =          Unknown
>> 
>> Then, I don't know yet whether this is intentional or this is a bug
>> in xterm.
>
> It was due to my XKB settings (only the "=" keypad key gave a
> KP_something keysym due to missing configuration for this key,
> contrary to the other keypad ones).

So it seems like this was not a bug in Emacs?  Could this bug
therefore be closed?

>                                     So, now that the "=" keypad
> key gives a normal "=" keysym, the problem is no longer visible
> in Emacs on my machine. However I'm still wondering about the
> remarks below:

I'm assuming you are here referring the difference between "^[OX" and
"\eOx"?  It seems to me that it's just a difference in how this keysym
is displayed by Emacs and tack.

>> And why the different case for "o" and "x" (uppercase in
>> tack, lowercase in Emacs)?
>> 
>> In any case, I can see nothing about kp-equal in the xterm.el file.
>> About the keypad, just:
>> 
>>     (define-key map "\eOj" [kp-multiply])
>>     (define-key map "\eOk" [kp-add])
>>     (define-key map "\eOl" [kp-separator])
>>     (define-key map "\eOm" [kp-subtract])
>>     (define-key map "\eOo" [kp-divide])
>>     (define-key map "\eOp" [kp-0])
>>     (define-key map "\eOq" [kp-1])
>>     (define-key map "\eOr" [kp-2])
>>     (define-key map "\eOs" [kp-3])
>>     (define-key map "\eOt" [kp-4])
>>     (define-key map "\eOu" [kp-5])
>>     (define-key map "\eOv" [kp-6])
>>     (define-key map "\eOw" [kp-7])
>>     (define-key map "\eOx" [kp-8])
>>     (define-key map "\eOy" [kp-9])

Best regards,
Stefan Kangas

Message #17 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 16645 <at> debbugs.gnu.org
Subject: Re: bug#16645: 24.3; in xterm, keypad = is translated to M-o x
Date: Sat, 28 Mar 2020 02:23:27 +0100

On 2020-03-28 01:55:40 +0100, Stefan Kangas wrote:
> Vincent Lefevre <vincent <at> vinc17.net> writes:
> 
> > On 2014-02-05 01:15:48 +0100, Vincent Lefevre wrote:
> >> On 2014-02-05 00:58:14 +0100, Vincent Lefevre wrote:
> >> > With "emacs -Q -nw" in xterm, the keypad = key (keysym 0xffbd, KP_Equal)
> >> > is translated to M-o x instead of the = character.
> >> 
> >> According to "tack", the keypad "=" gives:
> >> 
> >> ^[OX       Unknown
> >> 
> >> instead of
> >> 
> >> =          Unknown
> >> 
> >> Then, I don't know yet whether this is intentional or this is a bug
> >> in xterm.
> >
> > It was due to my XKB settings (only the "=" keypad key gave a
> > KP_something keysym due to missing configuration for this key,
> > contrary to the other keypad ones).
> 
> So it seems like this was not a bug in Emacs?

I think that there's something missing for Emacs. As I've said, the
xterm.el file contains only:

    (define-key map "\eOj" [kp-multiply])
    (define-key map "\eOk" [kp-add])
    (define-key map "\eOl" [kp-separator])
    (define-key map "\eOm" [kp-subtract])
    (define-key map "\eOo" [kp-divide])
    (define-key map "\eOp" [kp-0])
    (define-key map "\eOq" [kp-1])
    (define-key map "\eOr" [kp-2])
    (define-key map "\eOs" [kp-3])
    (define-key map "\eOt" [kp-4])
    (define-key map "\eOu" [kp-5])
    (define-key map "\eOv" [kp-6])
    (define-key map "\eOw" [kp-7])
    (define-key map "\eOx" [kp-8])
    (define-key map "\eOy" [kp-9])

Why nothing for [kp-equal]?

> >                                     So, now that the "=" keypad
> > key gives a normal "=" keysym, the problem is no longer visible
> > in Emacs on my machine. However I'm still wondering about the
> > remarks below:
> 
> I'm assuming you are here referring the difference between "^[OX" and
> "\eOx"?  It seems to me that it's just a difference in how this keysym
> is displayed by Emacs and tack.

But my point is that the case for "O" and "X" matters. For instance,
M-O A moves the cursor up, but M-O a is undefined.

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Message #20 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Vincent Lefevre <vincent <at> vinc17.net>
Cc: Stefan Kangas <stefan <at> marxist.se>, 16645 <at> debbugs.gnu.org
Subject: Re: bug#16645: 24.3; in xterm, keypad = is translated to M-o x
Date: Mon, 06 Sep 2021 11:36:10 +0200

Vincent Lefevre <vincent <at> vinc17.net> writes:

>     (define-key map "\eOx" [kp-8])
>     (define-key map "\eOy" [kp-9])
>
> Why nothing for [kp-equal]?

Yes, that seems odd.

Just to check -- does tack say that 9 on the keypad gives Ox and = on
the keypad gives OX?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #25 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Vincent Lefevre <vincent <at> vinc17.net>
Cc: Stefan Kangas <stefan <at> marxist.se>, 16645 <at> debbugs.gnu.org
Subject: Re: bug#16645: 24.3; in xterm, keypad = is translated to M-o x
Date: Mon, 06 Sep 2021 11:59:55 +0200

On Mär 28 2020, Vincent Lefevre wrote:

> Why nothing for [kp-equal]?

Probably because PC keyboards don't come with a '=' key on the keypad.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #28 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Stefan Kangas <stefan <at> marxist.se>, 16645 <at> debbugs.gnu.org
Subject: Re: bug#16645: 24.3; in xterm, keypad = is translated to M-o x
Date: Tue, 7 Sep 2021 11:53:52 +0200

On 2021-09-06 11:36:10 +0200, Lars Ingebrigtsen wrote:
> Vincent Lefevre <vincent <at> vinc17.net> writes:
> 
> >     (define-key map "\eOx" [kp-8])
> >     (define-key map "\eOy" [kp-9])
> >
> > Why nothing for [kp-equal]?
> 
> Yes, that seems odd.
> 
> Just to check -- does tack say that 9 on the keypad gives Ox and = on
> the keypad gives OX?

In xterm, tack says for the keypad keys 8, 9 and =:

^[Ox       (ka2)
^[Oy       (ka3)
^[OX       Unknown

So the meaning of ^[OX is unknown for tack and also ncurses.

I wonder whether this sequence is generated by xterm or some library.

On 2021-09-06 11:59:55 +0200, Andreas Schwab wrote:
> On Mär 28 2020, Vincent Lefevre wrote:
> 
> > Why nothing for [kp-equal]?
> 
> Probably because PC keyboards don't come with a '=' key on the keypad.

Indeed. The keypad of the PC keyboards seems to come from the
VT220 keypad block: ncurses has a file misc/terminfo.src with

# With the VT220 keypad block that uses the 1-9 keys as suggested in
# terminfo(5), the other keys can be handled with user-defined capabilities:
#
#   _______________________________________
#  | NumLock |    /    |    *    |    -    |
#  |         |   $Oo   |   $Oj   |   $OS   |
#  |_________|__kpDIV__|__kpMUL__|__kpSUB__|
#  |    7         8         9    |         |
#  |   $Ow   |   $Ox   |   $Oy   |    +    |
#  |_ka1__K1_|_________|_ka3__K3_|   $Ok   |
#  |    4    |    5    |    6    |  kpADD  |
#  |   $Ot   |   $Ou   |   $Ov   |         |
#  |_________|_kb2__K2_|_________|_________|
#  |    1    |    2    |    3    |         |
#  |   $Oq   |   $Or   |   $Os   |         |
#  |_kc1__K4_|_________|_kc3__K5_|  enter  |
#  |         0         |   .     |   $OM   |
#  |        $Op        |  $On    |         |
#  |___________________|_________|_kent_ <at> 8_|
#
xterm+keypad|xterm emulating VT100/VT220 numeric keypad,
        kp5=\EOE, kpADD=\EOk, kpCMA=\EOl, kpDIV=\EOo, kpDOT=\EOn,
        kpMUL=\EOj, kpSUB=\EOm, kpZRO=\EOp, use=vt220+keypad,

The keypad "=" key is an additional key on my Apple keyboard
(where the "+" key has a normal size instead of a double size,
allowing this additional key).

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Message #31 received at 16645 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Vincent Lefevre <vincent <at> vinc17.net>
Cc: Stefan Kangas <stefan <at> marxist.se>, Andreas Schwab <schwab <at> linux-m68k.org>,
 16645 <at> debbugs.gnu.org
Subject: Re: bug#16645: 24.3; in xterm, keypad = is translated to M-o x
Date: Wed, 08 Sep 2021 09:25:26 +0200

Vincent Lefevre <vincent <at> vinc17.net> writes:

> In xterm, tack says for the keypad keys 8, 9 and =:
>
> ^[Ox       (ka2)
> ^[Oy       (ka3)
> ^[OX       Unknown
>
> So the meaning of ^[OX is unknown for tack and also ncurses.

Thanks.

> The keypad "=" key is an additional key on my Apple keyboard
> (where the "+" key has a normal size instead of a double size,
> allowing this additional key).

Right.  Adding this mapping shouldn't regress anything, and it should
fix this issue, so I've now added the mapping to xterm.el in Emacs 28.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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